Wide-range speed control permanent magnet synchronous motor used for electric vehicle

Abstract

The invention discloses a wide-range speed control permanent magnet synchronous motor used for an electric vehicle. The wide-range speed control permanent magnet synchronous motor used for the electric vehicle comprises a shell body, wherein a front end cover and a rear end cover are installed at the two ends of the shell body respectively, a stator is installed inside the shell body, a rotor shaft is installed between the front end cover and the rear end cover, at least two rotor modules are installed on the rotor shaft in a sleeved mode, a spacing ring is installed between the rotor modules, a balancing ring is installed between each rotor module and the front end cover, and a balancing ring is installed between each rotor module and the rear end cover. Due to the fact that the at least two rotor modules are installed on the rotor shaft, the output torque and power of the motor can be increased by increasing the number of the rotor modules and the length of the stator on the premise that the radial size is not changed, and compatibility of the motor is improved greatly; by optimizing the magnetic structure, reducing air-gap field strength and weakening permanent magnet resistance, the maximum speed of revolution of the motor is increased and the speed control range of the motor is widened finally, and the constant-power range of the permanent magnet synchronous motor is widened greatly.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor, in particular to a wide speed-adjustable permanent magnet synchronous motor for electric vehicles. Background technique [0002] The existing motors used in electric vehicles are basically divided into two types. The first is the use of asynchronous motor variable frequency drive: the speed of the motor (rotor speed) is smaller than the speed of the rotating magnetic field, so it is called an asynchronous motor. It is basically the same as an induction motor. s=(ns-n) / ns. s is the slip rate, ns is the magnetic field speed, and n is the rotor speed. The asynchronous motor is an AC motor that generates electromagnetic torque through the interaction between the air gap rotating magnetic field and the induced current of the rotor winding, thereby realizing the conversion of electromechanical energy into mechanical energy. Asynchronous motors are divided into two types according to the rotor s...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a wide-speed adjustable permanent magnet synchronous motor for electric vehicles, which solves the problems of low working efficiency, large volume and weight, difficult installation on vehicles, and high cost of current motors

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